Fastener



FIG. 1 is a perspective view of a fastener, showing our new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a top view thereof,

FIG. 7 is right side view thereof; and,

FIG. 8 is a rear view thereof. 

CLAIM The ornamental design for a fastener, as shown and described. 